An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Phare SM, Peters-Golden M, Coffey MJ.Phare SM, et al.Eur Respir J. 1998 Nov;12(5):1141-6. doi: 10.1183/09031936.98.12051141.Eur Respir J. 1998.PMID: 9864011Free article.